curl -v -H "accept: application/fhir+xml" -X GET "http://fhirserver/CodeSystem/?_id=CodeSystem-Read-Example" 

{
  "locationCol": 276,
  "severity": "WARNING",
  "locationString": "Bundle.entry[0].resource/*CodeSystem/CodeSystem-Read-Example*/",
  "messageId": "Rule csd-0: 'Name should be usable as an identifier for the module by machine processing applications such as code generation' Failed",
  "locationLine": 2,
  "message": "Rule csd-0: 'Name should be usable as an identifier for the module by machine processing applications such as code generation' Failed"
}

{
  "severity": "INFORMATION",
  "locationString": "Bundle.entry[0].resource/*CodeSystem/CodeSystem-Read-Example*/",
  "message": "CodeSystems SHOULD have a stated value for the caseSensitive element so that users know the status and meaning of the code system clearly"
}

{
  "locationCol": 276,
  "severity": "WARNING",
  "locationString": "Bundle.entry[0].resource/*CodeSystem/CodeSystem-Read-Example*/.meta.profile[0]",
  "messageId": "Validation_VAL_Profile_Unknown",
  "locationLine": 2,
  "message": "Profile reference 'https://gematik.de/fhir/isik/StructureDefinition/ISiKCodeSystem' has not been checked because it is unknown"
}

{
  "severity": "WARNING",
  "messageId": "REFV_WARN_PASSED_PROFILE_DIFFERS_FROM_META_PROFILE",
  "message": "Resource meta.profile differs from the passed profile for validation: meta.profile=[]; passed=https://hl7.org/fhir/StructureDefinition/Bundle"
}

{"empty": false}